scalar: teach 'reconfigure' to optionally handle all registered enlistments

After a Scalar upgrade, it can come in really handy if there is an easy
way to reconfigure all Scalar enlistments. This new option offers this
functionality.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 58 insertions, 3 deletions

diff --git a/contrib/scalar/scalar.c b/contrib/scalar/scalar.c
index d7306b43ca..305b080663 100644
--- a/contrib/scalar/scalar.c
+++ b/contrib/scalar/scalar.c
@@ -488,22 +488,77 @@ static int cmd_register(int argc, const char **argv)
 	return register_dir();
 }
 
+static int get_scalar_repos(const char *key, const char *value, void *data)
+{
+	struct string_list *list = data;
+
+	if (!strcmp(key, "scalar.repo"))
+		string_list_append(list, value);
+
+	return 0;
+}
+
 static int cmd_reconfigure(int argc, const char **argv)
 {
+	int all = 0;
 	struct option options[] = {
+		OPT_BOOL('a', "all", &all,
+			 N_("reconfigure all registered enlistments")),
 		OPT_END(),
 	};
 	const char * const usage[] = {
-		N_("scalar reconfigure [<enlistment>]"),
+		N_("scalar reconfigure [--all | <enlistment>]"),
 		NULL
 	};
+	struct string_list scalar_repos = STRING_LIST_INIT_DUP;
+	int i, res = 0;
+	struct repository r = { NULL };
+	struct strbuf commondir = STRBUF_INIT, gitdir = STRBUF_INIT;
 
 	argc = parse_options(argc, argv, NULL, options,
 			     usage, 0);
 
-	setup_enlistment_directory(argc, argv, usage, options, NULL);
+	if (!all) {
+		setup_enlistment_directory(argc, argv, usage, options, NULL);
+
+		return set_recommended_config(1);
+	}
+
+	if (argc > 0)
+		usage_msg_opt(_("--all or <enlistment>, but not both"),
+			      usage, options);
+
+	git_config(get_scalar_repos, &scalar_repos);
 
-	return set_recommended_config(1);
+	for (i = 0; i < scalar_repos.nr; i++) {
+		const char *dir = scalar_repos.items[i].string;
+
+		strbuf_reset(&commondir);
+		strbuf_reset(&gitdir);
+
+		if (chdir(dir) < 0) {
+			warning_errno(_("could not switch to '%s'"), dir);
+			res = -1;
+		} else if (discover_git_directory(&commondir, &gitdir) < 0) {
+			warning_errno(_("git repository gone in '%s'"), dir);
+			res = -1;
+		} else {
+			git_config_clear();
+
+			the_repository = &r;
+			r.commondir = commondir.buf;
+			r.gitdir = gitdir.buf;
+
+			if (set_recommended_config(1) < 0)
+				res = -1;
+		}
+	}
+
+	string_list_clear(&scalar_repos, 1);
+	strbuf_release(&commondir);
+	strbuf_release(&gitdir);
+
+	return res;
 }
 
 static int cmd_run(int argc, const char **argv)